python 计算圆形度。

如何使用python 计算圆形度

 

import numpy as np
import cv2 as cv
img = cv.imread(r'D:\PythonProject\QTNLS\analysis\1.png',0)
img = cv.medianBlur(img,5)
cimg = cv.cvtColor(img,cv.COLOR_GRAY2BGR)
circles = cv.HoughCircles(img,cv.HOUGH_GRADIENT,1,20,
                            param1=300,param2=30,minRadius=20,maxRadius=100)
circles = np.uint16(np.around(circles))


for i in circles[0,:]:
    # draw the outer circle
    cv.circle(cimg,(i[0],i[1]),i[2],(0,255,0),2)
    # draw the center of the circle
    cv.circle(cimg,(i[0],i[1]),2,(0,0,255),3)
cv.imshow('detected circles',cimg)
cv.waitKey(0)
cv.destroyAllWindows()

 

 

 

调试了两个小时的黄金教训：

circles = cv.HoughCircles(image, cv.HOUGH_GRADIENT, 1,50,
                          param1=51, param2=20, minRadius=round(abs(radius-10)), maxRadius=round(abs(radius+10)))

 

 

minRadius=round(abs(radius-10)), maxRadius=round(abs(radius+10)) 在两个参数如果选择的合理的话，准确率能到95%以上